Anchor bolt holder for concrete forms



Feb. 14, 1967 F H. JONES 3,304,079

ANCHOR BOLT HOLDER FOR CONCRETE FORMS Filed NOV. 9, 1964 Forresffldones INVENTOR United States Patent Ofitice Patented Feb. 14, 1967 3,304,079 ANCHOR BOLT HOLDER FOR CONCRETE FORMS Forrest H. Jones, P.O. Box 67, Rufus, Greg. 97050 Filed Nov. 9, 1964, Ser. No. 409,816 8 Claims. (Cl. 269-487) This invention pertains to holders for locating anchor bolts in concrete forms preliminary to pouring a concrete structure in which the anchor bolts are to be embedded.

In the drawings:

FIG. 1 is a transverse sectional view through a case concrete structure, preliminary to stripping the form, and illustrating a prior art method of locating anchor bolts in the form;

FIG. 2 is a view in side elevation of the presently described anchor bolt holder, illustrating its mode of application to a concrete form;

FIG. 3 is a plan view of the anchor bolt holder of FIG. 2;

FIG. 4 is a transverse sectional view through the longitudinal center line of the anchor bolt holder of FIGS. 1 and 2, further illustrating its construction; and

FIG. 5 is a fragmentary view similar to FIG. 4, illustrating the anchor bolt holder of my invention in an alternate embodiment.

In the erection of dams and in other heavy construction work, the location of the anchor bolts in the forms has been time consuming and expensive. For example, in the situation illustrated in FIG. 1, it may be necessary when erecting a concrete dam to cast in the concrete a recess in which the seat for the dam gate is to be bolted by means of anchor J-bolts 10. This is accomplished using a form 12 having dimensions appropriate to define the recess. Holes 14 are drilled through the form to locate the anchor bolts.

It then requires three men, two workmen and a transit man, to mount the anchor bolts properly prior to pouring the concrete. First, the transit man determines the level at which the bolts are to be set, for example to the level of the inner surface of locking strip 16 to be installed later. Next a workman located in the area behind the form inserts bolts through openings 14 in the form and through registering openings 18 in a bolt support plate 20 tacked to the form.

Nuts 22 are threaded on the threaded outer ends of bolts 10 by a. second workman located in front of the form. The nuts are adjusted until the elevation of the outer ends of the bolts is at the precise level demanded by the plans. Locking strip 16 then is nailed in place. Together with support plate 20, it locates the bolts exactly while the concrete is poured.

The concrete is poured and allowed to harden, after which form 12 is stripped from the pour. This usually necessitates removing nuts 22 and destroying the form, already mutilated by the presence of bolt holes 14, since it is otherwise impossible to remove the form from the exposed ends of the bolts.

Substantial economic loss thus is incurred, first because of the unnecessarily high labor costs involved in constructing the form and locating the bolts, and secondly because of the necessity of constructing new forms for each new installation.

It is the general object of this invention to provide an anchor bolt holder for concrete forms which overcomes the foregoing diificulties in that the anchor bolts may be installed and set to level by a single workman and in that after the concrete has hardened, the forms may be stripped without damaging the forms, which then may be reused.

It is a further important object of the present invention to provide an anchor bolt holder which effectively seals ofl the area around the exposed shank portion of each bolt to prevent leakage of cement through the forms during pouring.

Still another object of the present invention is to provide an anchor bolt holder which may be supplied in one standard size and which, by making a simple change, may be adapted for use with anchor bolts of varying cross sectional dimension.

As shown in FIGS. 2-4, the anchor bolt holder of my invention may be employed for locating and supporting conventional J-bolts 30 having an inner end 32 to be embedded in a concrete pour; a central shank portion 34 to be partly embedded in the pour; and an outer threaded portion 36 to be located beyond the plane of the pour. The bolts are to be located by and supported in a concrete form 40 of steel or wood provided with openings 42 dimensioned to receive the bolts at predetermined locations.

Each bolt holder is mounted on a base having a central opening dimensioned to overlie a selected one of the openings 42 through the form. Although the base may comprise a single plate having a central opening cut through it, in the illustrated form of the invention it comprises two separate plate sections 44 mounted one on each side of opening 42 and secured to the form by suitable means, as by means of bolts 46.

Extending outwardly from the base are a pair of cooperating standards 48 which preferably are formed as half-round tubular sections of suitable diameter to contain the bolt. The inner ends of the standards are hinged to the base by appropriate hinge means such as the knuckle type hinges 50.

The standards are arranged with respect to each other and with respect to the base sections in such a manner that they may be moved angularly toward and away from each other between a closed, operative position in which they support bolt 30 and a separated, inoperative position in which they are removed from the bolt, as shown in FIG. 2.

At the base of standards 48 there preferably are present sealing means for preventing leakage of fluid concrete through opening 42 when the form is in use. The construction of the sealing means is illustrated particularly in FIG. 4.

A sealing collar is fixed to, or formed integrally with, the lower portion of each of standards 48, in two complementary parts, each of which is indicated at 52. The inside portion of each collar part forms a seat which is dimensioned to receive a sealing collar segment 54. This is dimensioned to fit snugly in the seat and together with its companion segment, to press tightly around the shank of bolt 34 when the standards are in their operative position, thus sealing oil? opening 42.

An internally threaded collar, also illustrated particularly in FIG. 4, is present on the outer ends of standards 48. It serves the function of engaging the threaded section 36 of the anchor bolt, thus supporting the bolt and permitting its adjustment to the desired elevation.

Like the sealing collar, the threaded collar is formed in two matching parts 56. These complement each other and form a continuous collar when the standards are in their erect, operative position.

It is a particular feature of the invention that threaded collar 56 may be employed to support anchor bolts of the conventional sizes, for example, anchor bolts having diameters of one-half inch, /8 inch and inch, without using separate holders for each size and without making a fundamental and difficult adjustment of a holder of a particular size.

To this end there is provided in conjunction with each of threaded sections 56 an annular seat segment 58.

Where anchor bolts of maximum size are employed, the threads of which are dimensioned for reception in threaded section 56 of the holder, seat segments 58 may be left empty. 7

However, to accommodate the holder to anchor bolts 60 of smaller size, FIG. 5, there may be inserted in the seat segment 58 of each standard a collar segment 62. This may be formed of rubber, plastic or other deformable structural material and isdimensioned to fit snugly in the seat with its inner bore pressed in self-threading relation against the threads of bolt 60.

Releasable lock means are provided for releasably locking together standards 48 when they are in their upright, operative position. Although various means may be employed for this purpose, a preferred means comprises a plurality of perforated tabs 64 alternated on the respective sides of the respective standards as shown in FIG. 2, with the perforations through the tabs in registration with each other.

Pin means such as nail 66, readily available on the construction site, then may be inserted through the registering perforations to maintain the standards in their operative positions in which gasket sections 54 are pressed tightly against the shank of bolt 30, sealing 01f form openings 42, and in which washers 62, if employed, press snugly against the threaded section of bolt 60.

In the use of the anchor bolt holders of my invention the holders are mounted on the outside faces of concrete forms 40, there being one holder for each of openings 42 in the form, as required to locate the desired number of bolts in a predetermined pattern. With the holder in the dotted line position of FIG. 2, a single workman inserts the inner end of each bolt through the corresponding opening 42.

With the bolt in its approximate final elevation, he then swings the two standards 48 together to the full line position of FIG. 2 and inserts locking pin 66 through tabs 64. To adjust the bolt to the elevation set by survey, it then merely is necessary to grasp the exposed outer threaded end 36 of the bolt with a pair of pliers or other tool and turn the bolt until the desired elevation is reached.

Where the bolt holder is to be used with a bolt 60 of smaller diameter, the foregoing procedure is modified by inserting in seat segments 58 of the holder, deformable washer segments 62 having an internal bore such that when the standards are closed, the washer segments press against the threaded section of the bolt. The washer thus forms its own threads so that by grasping the exposed outer end of the bolt and rotating it, the bolt may be raised or lowered to the proper height, as above described.

After all of the bolts have been set, the concrete may be poured into the form and allowed to harden. When it is wished to strip the forms from the hardened concrete, pins 66 are removed and standards 48 separated by swinging them outwardly. With the standards in this position, it is possible to strip off the forms rapidly and without damage.

It thus will be apparent that by the present invention, I have provided an anchor bolt holder which may be used with concrete forms to great advantage in that a minimum of labor is required for installation and adjustment of the anchor bolts; the bolts may be adjusted rapidly with a high degree of accuracy; leakage of the 4 poured concrete through the anchor bolt openings in the form is prevented; and a single holder may be used readily with anchor bolts of varying cross section.

Having thus described my invention, I claim:

1. An anchor bolt holder for a concrete form having therethrough at predetermined locations openings for the reception of anchor bolts including a shank portion and a threaded outer end, the holder comprising:

(a) a base having a central opening,

(b) means for mounting the base on the outside face of the form with the central opening of the base overlying a selected one of the openings through the form,

(c) a pair of spaced standards extending upwardly from the base,

((1) hinge means separately hinging the inner ends of the standards to the base on opposite sides of the opening and arranged to permit angular movement of the standards toward and away from each other,

(e) an internally threaded collar formed in two complementary parts, one of the parts being mounted on the outer end of each of the standards in collartorming relation to the other part, the collar being dimensioned to receive the threaded end of the anchor bolt, and

(f) lock means for releasably locking together the two parts of the collar in their collar-forming relation.

2. The anchor bolt holder of claim 1 wherein the base is formed in two sections, one being mounted on each side of the form opening and thereby forming the central opening of the base.

3. The anchor bolt holder of claim 1 wherein the two standards comprise half round sections of a pipe.

4. The anchor bolt holder of claim 1 wherein the diameter of the internally threaded collar is larger than the diameter of the threaded outer end of the anchor bolt, and wherein the collar is provided with an inner, annular seat and a deformable washer seated therein, the opening through the washer being dimensioned to receive and engage the threaded end of the bolt in selfthreading relation.

5. The anchor bolt holder of claim 4 wherein the washer comprises a rubber washer.

6. The anchor bolt holder of claim 1 including seal collar means formed in two complementary parts mounted one on the base of each standard adjacent the central opening therein in seal-collar-forming relation, the sealcollar being adapted to engage the shank portion of the anchor bolt mounted in the holder, sealing off the opening through the form.

7. The anchor bolt holder of claim 6 wherein the seal collar means comprises a pair of gasket seat members mounted one on each standard and a pair of complementary gasket members seated therein.

8. The anchor bolt holder of claim 1 wherein the lock means comprise overlapping perforated tabs on the respective standards and pin means removably insertable through the perforations in the tabs.

No references cited.

WILLIAM W. DYER, JR., Primary Examiner W. D. BRAY, Assistant Examiner 

1. AN ANCHOR BOLT HOLDER FOR A CONCRETE FORM HAVING THERETHROUGH AT PREDETERMINED LOCATIONS OPENINGS FOR THE RECEPTION OF ANCHOR BOLTS INCLUDING A SHANK PORTION AND A THREADED OUTER END, THE HOLDER COMPRISING: (A) A BASE HAVING A CENTRAL OPENING, (B) MEANS FOR MOUNTING THE BASE ON THE OUTSIDE FACE OF THE FORM WITH THE CENTRAL OPENING OF THE BASE OVERLYING A SELECTED ONE OF THE OPENINGS THROUGH THE FORM, (C) A PAIR OF SPACED STANDARDS EXTENDING UPWARDLY FROM THE BASE, (D) HINGE MEANS SEPARTELY HINGING THE INNER ENDS OF THE STANDARDS TO THE BASE ON OPPOSITE SIDES OF THE OPENING AND ARRANGED TO PERMIT ANGULAR MOVEMENT OF THE STANDARDS TOWARD AND AWAY FROM EACH OTHER, (E) AN INTERNALLY THREADED COLLAR FORMED IN TWO COMPLEMENTARY PARTS, ONE OF THE PARTS BEING MOUNTED ON THE OUTER END OF EACH OF THE STANDARDS IN COLLAR- 